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Micronuclear effects on the root tips of Vicia faba induced by tap water
| Spots | MCN‰ (¯x ± s) | Induced effects |
| Changping | 3.33 ± 0.57 | - |
| Zhongdong | 4.33 ± 0.55 | - |
| Nongyang | 5.00 ± 1.00 | - |
| Tangan | 4.12 ± 0.87 | - |
| Yiqiao | 3.80 ± 0.51 | - |
| Distilled water | 4.30 ± 0.50 | |
| K2Cr2O7 | 25.71 ± 2.91b | + |
P < 0.01.
